SincSerial Port Interruptions

Hi,
I am designing a program which use the syncronous serial port. But i
have found a problem, I cannot program the device by interruptions. I
have been trying to program the syncserial like a normal serial port,
with the same functions, but I get nothing.
Have I made something wrong? How can I program the syncronous serial
port with interruptions?
thanks a lot,
Francisco